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hopefully

they will tune up performance a little bit. even on lowest details the gameplay is not really smooth on my passive-cooled nvidia 9500gt (with proprietary drivers). i do not see a thing when trying to run in window-mode.

What do you mean Humble Bundle store? Trine 2 hasn't been in any Humble Bundle yet.

Well don't ask me.
When you choose to buy it from their site you do so using the widget from the Humble Bundle store.

The whole transaction etc. goes through Humble Bundle and afterwards you get a link with a key, where you can download the game, from the usual Humble Bundle page (as can be seen from the screenshot earlier in this thread).

You buy it from that widget on trine2.com, you get an email with a link to https://www.humblebundle.com/s?key=XXXXXX and there you can get it with a direct download or with a torrent (which has no access restrictions at all, you just need to know the url...)
Neither the installer nor the game itself need you to enter a key.

Well don't ask me.
When you choose to buy it from their site you do so using the widget from the Humble Bundle store.

The whole transaction etc. goes through Humble Bundle and afterwards you get a link with a key, where you can download the game, from the usual Humble Bundle page (as can be seen from the screenshot earlier in this thread).

Again, what's with 'unlock it on steam'?
Of course, there's no steam for linux, so that may very well be a copy/paste from the windows version.